Any of numerous usually evergreen ornamental shrubs of the genus Rhododendron of the North Temperate Zone, having clusters of variously colored, often bell-shaped flowers.
a bush with large red, pink, white or purple flowers.
The only song that springs to mind that you could be referring to is "Do the Strand" where in one line Ferry croons "Rhodendron is a nice flower Ever green it lasts for ever But it can't beat Strand power" It is a really rocky track from the great second album called "For your pleasure" and was the last one to feature the very brilliant Brian Eno.
ANSWER:Live rhodendron contains gryanotoxin, which is poisonous if ingested. When burned the gryanotoxin is destroyed at temperatures of 300 degres and above, and no evidence of toxicity has been found in the smoke or coals of the rhododendron plant. It is a hard long-burning wood and can be used safely. However, inhalation of any smoke from a fire can have harmful health effects and should generally be avoided.When burning wood in a fireplace always be sure to have a proper draft; no smoke or vapors from the burning wood should be entering the living area.